Try it, whether it is convenient to use that key combination?My idea was to "min" and "max" were as close as possible to each other, "all" as a complement to them.

Or do you suggest as suggested by natebeaty? I'm sorry, but I got confused in the proposals

These keymaps work fine for Windows 7 and are as good as others.My personal preference go to natebeaty proposition cos all his keymaps share the same 'base' (alt+up/down) and you add one or two more key to increase the increment, find it easy to remember and easy to use.

But anyway the only important thing is to have functional keymaps in all OS. People could change them easy to what they want.Thanks again for your works.